8. Yes. See here:

I told Abramson that this is what he will hear when he brings up hemp to his advisers in Frankfort: “Hemp is related to marijuana, and if it is legalized marijuana growers can and will hide their marijuana plants in hemp fields.” Of course, this reasoning is absolutely bogus because when hemp and marijuana cross-pollinate, as they do naturally, marijuana’s THC level (the chemical that gets you high) decreases.

That’s right, the potency of marijuana decreases if it is surrounded by hemp. Only boneheaded marijuana growers would even consider growing marijuana near hemp, because the quality of their pot would quickly go down the tubes. In fact, the single most effective action the government could take to weaken marijuana would be to immediately rescind anti-hemp laws and allow the growth of industrial hemp.

Reality: Hemp is grown quite differently from marijuana. Moreover, it is harvested at a different time than marijuana. Finally, cross-pollination between hemp plants and marijuana plants would significantly reduce the potency of the marijuana plant.

Legal hemp could net big money for farmers Posted on June 11, 2012
By Andrea Suozzo

Netaka White, bio-energy program director at the Vermont Sustainable Jobs Fund, told some 15 people gathered at the Addison County Regional Planning Commission that by his rough calculations American farmers could make as much as $3,800 per acre of industrial hemp,...

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Additionally, said White, when the two types of cannabis plant are allowed to cross-pollinate, THC levels in the marijuana become diluted and the resulting drug is less potent. That means industrial hemp would be unlikely to provide a cover for a marijuana-growing operation.